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` Y(No Modem G. BQ MASSEY. GQMAPQUND ENGINE.r

Patented Jan. 17.11882.

WITNE ATTORNEYS.

N verses. Pnmumngnphur. wauwau. neL

y UNITED `STATES GIDEouBQMAssEY, or

NEW YORK, x.

TRUsTEE, E .SAME rLAoE.

Y., ASSIGNORTO JACOB LORILLARD,

COM POUND ENGIN E.

-SPECFICATION forming part of Letters atent-No. 252,485, dated January 17, 1882; 9 y Application led December 2, 1881. (No model.)

To all whom Macy concern:

Be it known that* L'GIDEoN BLACKBURN MASSEY, ofthe city, county, and State of New York, have invented certain `new and useful Improvements in Compound En gines, of which the following is a full, clear, and exact description. t

My improvements relate to the class of engines in which low-pressure cylinders for using 1o the exhaust-steam are combined with the cylinders using steam under highpressure.

The object of my invention is to obviate the difficult y heretofore experienced from backpressure and longopenings or connecting-pipes,

which I accomplish by direct and continuously open connections between the two cylinders and a compound piston in the high-pressure cylinders, whereby the primary and secondary exhausts are regulated, as hereinafter zo described and claimed.

Reference is to behad to the accompanying drawings; forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a longitudinal section of the engine. Fig. 2 is a longitudinal section of the high-pressure cylinder in a'plane at right anv gles toFig. 1.

A is the high-pressure cl. linder. B is the 3o lowpressure cylinder, shown as bolted directly to a cored side extension, a, of the cylinder A; but the two cylinders may be cast together and cored as shown. The cylinders communicate by ports b b through the connection a at the '435 ends of cylinder B, opening into cylinder A a distance from its ends equal to about half `the length of the stroke. The ports b b' are connected for reversing the engine, and in connection with the ports b b reversing-valves 4o c c are fitted for operation to open and close with the main steam and exhaust openingsff';

and at the mid-length of cylinder A is an exhaust-port, g. h h h' Mare valyes fitted in con.

nection with portse and operated by suitable 5o connections from a rocking lever or link at i. The lever t' will be moved by cccentrics on the main shaft 7c.

l l are pistons in cylinder A, connected on roden.

n is the slide of the piston-rod, connected by a rod, o, to one' crank ofthe shaft 7c.

q is the piston of cylinder B.

p is the piston-rod from slide q', that connects by rod r to a second crankon shaft It, 6o the two cranks' being quartered. -The space between the two pistons lis slightly less than the length of stroke, so that the middle or sec oudary lexhaust-port, g, is continuously between the pistons, and at half-stroke both primary exhaust-poits b are covered, the piston g of cylinder B heilig at the same moment at the end of its stroke. In the drawings the pistons l are shown at half-stroke, moving downward.` At this .point the steam is out off from the 7o boiler. i.

The operation is as follows: Steam entering through the upper steam-portfe, piston l is forced down, at half-stroke, steam-valve h is closed, thereby cutting oft' steam from the 75 boiler, and atthis point, piston l passing port b,

- the steam exhausts on piston q of cylinder B,

which is forced downward simultaneously with piston Z by the force of expanding steam until piston lreaches the end ot' its stroke and pis- 8: ton qis at half-stroke, when piston Zcommences its return stroke, while piston q continues downward. As soon as piston l passes port b` steam from cylinder B exhausts through ports b and g to the open air r condenser. At the same instant upper exhaust-valve It is opened and the steam shut in the upper end of cylinder'A is exhausted through portf, which com- B, which will more than overbalance the bach pressure on piston lthrough the rst half ot' its return-stroke.

' It is to be observed that this engine has no long openings to connect the high and low pressure cylinders or receiver between the two,

which reduces the pressure of the expandingl steam before it reaches the low-pressure cylinder by increase of'volume and by condensation; nor has it any working-valvesto the lowpressure cylinder, the pistons of high-pressure cylinder serving in place of valve to open and close the ports. In reversal the connected vports b b allow exhaust to the same end of cylinder B as before, thus maintaining the lead of a half-stroke of the high-pressure cylinder.

haust-ports both at its mid-length and its ends, n

substantially as shown and described.

2. In compound engines, the combination'bf the high-pressure cylinder A, having two pistons upon the saine rod, and provided with steam-ports e at its ends and exhaust-ports e `at its ends and g at its mid-length, and the 10W- pressure cylinder B, having a single piston and communicating with cylinder A by short direct ports bb', thc said cylinders having each a single chamber, lsubstantially as shown and described.

3. The combination and arrangement of the stationary reversing-valves c c with the ports b b' and their connecting-cores between the high and low pressure cylinders of a compound engine, substantially as shown and described.y

4. The combination of direct exhaustports b b', connected by cores and reversing-valves c, with the cylinders A B, substantiall-yas shown7 to allow reversa-l of the engine, and maintaining the proper lead of the high-pressure pistons.

GIDEON B. MASSEY.

Witnesses:

GEO. D. WALKER, C. SEDGWICK. 

